I recently upgraded to akka cluster 2.6 and noticed that in distributed pub sub outgoing messages starts dropping after queue size reaches 3k unsent messages. That is very different behavior from all previous versions; project started with Akka cluster 2.3 and even in 2.5 it still buffers enough messages to not drop on spikes.
I am not sure how to fix this, I read section about different types of mailboxes but mailbox is at receiving actor and messages are dropped in sender JVM before going over wire.
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